2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file dccp_send.c Paraslash's dccp sender. */
10 * based on server.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
15 #include <sys/types.h>
30 #include "close_on_fork.h"
31 #include "chunk_queue.h"
32 #include "server.cmdline.h"
35 /** Do not write more than that many bytes at once. */
36 #define DCCP_MAX_BYTES_PER_WRITE 1024
38 static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
40 static void dccp_pre_select(int *max_fileno, fd_set *rfds,
41 __a_unused fd_set *wfds)
43 if (dss->listen_fd >= 0)
44 para_fd_set(dss->listen_fd, rfds, max_fileno);
47 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
49 struct sender_client *sc;
51 if (dss->listen_fd < 0 || !FD_ISSET(dss->listen_fd, rfds))
53 sc = accept_sender_client(dss);
57 * Bypass unused CCID paths: the sender does not receive application data
58 * from the client; by shutting down this unused communication path we can
59 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
61 if (shutdown(sc->fd, SHUT_RD) >= 0)
63 PARA_WARNING_LOG("%s\n", strerror(errno));
64 shutdown_client(sc, dss);
67 static void dccp_send(long unsigned current_chunk,
68 __a_unused long unsigned chunks_sent, const char *buf,
69 size_t len, const char *header_buf, size_t header_len)
71 struct sender_client *sc, *tmp;
73 list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
74 send_chunk(sc, dss, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf,
75 len, header_buf, header_len);
78 static void dccp_shutdown_clients(void)
80 shutdown_clients(dss);
83 static int dccp_com_on(__a_unused struct sender_command_data *scd)
85 return generic_com_on(dss, IPPROTO_DCCP);
88 static int dccp_com_off(__a_unused struct sender_command_data *scd)
95 static int dccp_com_deny(struct sender_command_data *scd)
97 generic_com_deny(scd, dss);
101 static int dccp_com_allow(struct sender_command_data *scd)
103 generic_com_allow(scd, dss);
108 * Return list of available CCIDs or warning, in static buffer.
110 static const char *dccp_list_available_ccids(void)
112 uint8_t ccids[DCCP_MAX_HOST_CCIDS];
113 uint8_t nccids = sizeof(ccids), i, len;
114 /* Worst case length: n * 3 digits + n-1 spaces + '\0' */
115 static char list[DCCP_MAX_HOST_CCIDS * 4];
117 if (dccp_available_ccids(ccids, &nccids) == NULL) {
118 snprintf(list, sizeof(list), "Unable to query available CCIDs");
120 for (i = len = 0; i < nccids; i++)
121 len += snprintf(list + len, sizeof(list) - len,
122 "%s%d", i ? " " : "", ccids[i]);
127 static char *dccp_info(void)
129 char *info = get_sender_info(dss, "dccp");
130 char *ret = make_message("%s" "\tsupported ccids: %s\n",
131 info, dccp_list_available_ccids());
137 * The init function of the dccp sender.
139 * \param s pointer to the dccp sender struct.
141 * It initializes all function pointers of \a s and starts
142 * listening on the given port.
144 void dccp_send_init(struct sender *s)
150 s->pre_select = dccp_pre_select;
151 s->post_select = dccp_post_select;
152 s->shutdown_clients = dccp_shutdown_clients;
153 s->help = generic_sender_help;
154 s->client_cmds[SENDER_ON] = dccp_com_on;
155 s->client_cmds[SENDER_OFF] = dccp_com_off;
156 s->client_cmds[SENDER_DENY] = dccp_com_deny;
157 s->client_cmds[SENDER_ALLOW] = dccp_com_allow;
158 s->client_cmds[SENDER_ADD] = NULL;
159 s->client_cmds[SENDER_DELETE] = NULL;
161 init_sender_status(dss, conf.dccp_access_arg, conf.dccp_access_given,
162 conf.dccp_port_arg, conf.dccp_max_clients_arg,
163 conf.dccp_default_deny_given);
164 ret = generic_com_on(dss, IPPROTO_DCCP);
166 PARA_ERROR_LOG("%s\n", para_strerror(-ret));